refactor: make mask renderer dispatch explicit

Made-with: Cursor

13 files changed, 597 insertions, 502 deletions

diff --git a/apps/web/src/masks/definitions/cinematic-bars.ts b/apps/web/src/masks/definitions/cinematic-bars.ts
index 36b31328..68717c02 100644
--- a/apps/web/src/masks/definitions/cinematic-bars.ts
+++ b/apps/web/src/masks/definitions/cinematic-bars.ts
@@ -71,7 +71,7 @@ function buildBandPath({
 	return path;
 }
 
-export const cinematicBarsMaskDefinition: MaskDefinition<RectangleMaskParams> = {
+export const cinematicBarsMaskDefinition: MaskDefinition<"cinematic-bars"> = {
 	type: "cinematic-bars",
 	name: "Cinematic Bars",
 	features: {
@@ -94,42 +94,51 @@ export const cinematicBarsMaskDefinition: MaskDefinition<RectangleMaskParams> =
 	},
 	computeParamUpdate: computeBoxMaskParamUpdate,
 	renderer: {
-		buildPath({ resolvedParams, width, height }) {
-			const params = resolvedParams as RectangleMaskParams;
-			const centerX = width / 2 + params.centerX * width;
-			const centerY = height / 2 + params.centerY * height;
-			const maskWidth = Math.max(params.width * width, width);
-			const maskHeight = Math.max(params.height, 0.01) * height;
-			const rotationRad = (params.rotation * Math.PI) / 180;
+		body: {
+			kind: "fillPath",
+			buildPath({ resolvedParams, width, height }) {
+				const params = resolvedParams;
+				const centerX = width / 2 + params.centerX * width;
+				const centerY = height / 2 + params.centerY * height;
+				const maskWidth = Math.max(params.width * width, width);
+				const maskHeight = Math.max(params.height, 0.01) * height;
+				const rotationRad = (params.rotation * Math.PI) / 180;
 
-			return buildBandPath({
-				centerX,
-				centerY,
-				halfWidth: maskWidth / 2,
-				halfHeight: maskHeight / 2,
-				rotationRad,
-			});
+				return buildBandPath({
+					centerX,
+					centerY,
+					halfWidth: maskWidth / 2,
+					halfHeight: maskHeight / 2,
+					rotationRad,
+				});
+			},
 		},
-		buildStrokePath({ resolvedParams, width, height }) {
-			const params = resolvedParams as RectangleMaskParams;
-			const centerX = width / 2 + params.centerX * width;
-			const centerY = height / 2 + params.centerY * height;
-			const rotationRad = (params.rotation * Math.PI) / 180;
-			const offset = getStrokeOffset({
-				strokeAlign: params.strokeAlign,
-				strokeWidth: params.strokeWidth,
-			});
+		stroke: {
+			kind: "strokeFromPath",
+			buildStrokePath({ resolvedParams, width, height }) {
+				const params = resolvedParams;
+				const centerX = width / 2 + params.centerX * width;
+				const centerY = height / 2 + params.centerY * height;
+				const rotationRad = (params.rotation * Math.PI) / 180;
+				const offset = getStrokeOffset({
+					strokeAlign: params.strokeAlign,
+					strokeWidth: params.strokeWidth,
+				});
 
-			return buildBandPath({
-				centerX,
-				centerY,
-				halfWidth: Math.max((Math.max(params.width * width, width) / 2) + offset, 1),
-				halfHeight: Math.max(
-					(Math.max(params.height, 0.01) * height) / 2 + offset,
-					1,
-				),
-				rotationRad,
-			});
+				return buildBandPath({
+					centerX,
+					centerY,
+					halfWidth: Math.max(
+						Math.max(params.width * width, width) / 2 + offset,
+						1,
+					),
+					halfHeight: Math.max(
+						(Math.max(params.height, 0.01) * height) / 2 + offset,
+						1,
+					),
+					rotationRad,
+				});
+			},
 		},
 	},
 };
diff --git a/apps/web/src/masks/definitions/custom.ts b/apps/web/src/masks/definitions/custom.ts
index cd6e2055..6e0f7af6 100644
--- a/apps/web/src/masks/definitions/custom.ts
+++ b/apps/web/src/masks/definitions/custom.ts
@@ -308,7 +308,7 @@ function computeCustomMaskParamUpdate({
 	};
 }
 
-export const customMaskDefinition: MaskDefinition<CustomMaskParams> = {
+export const customMaskDefinition: MaskDefinition<"custom"> = {
 	type: "custom",
 	name: "Custom",
 	features: {
@@ -447,71 +447,77 @@ export const customMaskDefinition: MaskDefinition<CustomMaskParams> = {
 		return params.closed;
 	},
 	renderer: {
-		buildPath({ resolvedParams, width, height }) {
-			const params = resolvedParams as CustomMaskParams;
-			const points = params.path;
-			if (!params.closed) {
-				return new Path2D();
-			}
+		body: {
+			kind: "fillPath",
+			buildPath({ resolvedParams, width, height }) {
+				const params = resolvedParams;
+				const points = params.path;
+				if (!params.closed) {
+					return new Path2D();
+				}
 
-			return buildCustomMaskPath2D({
-				points,
-				centerX: params.centerX,
-				centerY: params.centerY,
-				rotation: params.rotation,
-				scale: params.scale,
-				bounds: {
-					cx: width / 2,
-					cy: height / 2,
-					width,
-					height,
-					rotation: 0,
-				},
-				closed: true,
-			});
+				return buildCustomMaskPath2D({
+					points,
+					centerX: params.centerX,
+					centerY: params.centerY,
+					rotation: params.rotation,
+					scale: params.scale,
+					bounds: {
+						cx: width / 2,
+						cy: height / 2,
+						width,
+						height,
+						rotation: 0,
+					},
+					closed: true,
+				});
+			},
 		},
-		renderStroke({ resolvedParams, ctx, width, height }) {
-			const params = resolvedParams as CustomMaskParams;
-			if (!params.closed) {
-				return;
-			}
+		stroke: {
+			kind: "renderStroke",
+			renderStroke({ resolvedParams, ctx, width, height }) {
+				const params = resolvedParams;
+				if (!params.closed) {
+					return;
+				}
 
-			const points = params.path;
-			const path = buildCustomMaskPath2D({
-				points,
-				centerX: params.centerX,
-				centerY: params.centerY,
-				rotation: params.rotation,
-				scale: params.scale,
-				bounds: {
-					cx: width / 2,
-					cy: height / 2,
-					width,
-					height,
-					rotation: 0,
-				},
-				closed: true,
-			});
+				const points = params.path;
+				const path = buildCustomMaskPath2D({
+					points,
+					centerX: params.centerX,
+					centerY: params.centerY,
+					rotation: params.rotation,
+					scale: params.scale,
+					bounds: {
+						cx: width / 2,
+						cy: height / 2,
+						width,
+						height,
+						rotation: 0,
+					},
+					closed: true,
+				});
 
-			ctx.save();
-			ctx.strokeStyle = params.strokeColor;
-			ctx.lineWidth = params.strokeWidth;
-			ctx.lineJoin = "round";
-			ctx.lineCap = "round";
-			ctx.stroke(path);
+				ctx.save();
+				ctx.strokeStyle = params.strokeColor;
+				ctx.lineWidth = params.strokeWidth;
+				ctx.lineJoin = "round";
+				ctx.lineCap = "round";
+				ctx.stroke(path);
 
-			if (params.strokeAlign === "inside") {
-				ctx.globalCompositeOperation = "destination-in";
-				ctx.fillStyle = "#ffffff";
-				ctx.fill(path);
-			}
+				if (params.strokeAlign === "inside") {
+					ctx.globalCompositeOperation = "destination-in";
+					ctx.fillStyle = "#ffffff";
+					ctx.fill(path);
+				}
 
-			if (params.strokeAlign === "outside") {
-				ctx.globalCompositeOperation = "destination-out";
-				ctx.fillStyle = "#ffffff";
-				ctx.fill(path);
-			}
-			ctx.restore();
+				if (params.strokeAlign === "outside") {
+					ctx.globalCompositeOperation = "destination-out";
+					ctx.fillStyle = "#ffffff";
+					ctx.fill(path);
+				}
+				ctx.restore();
+			},
 		},
 	},
 };
diff --git a/apps/web/src/masks/definitions/diamond.ts b/apps/web/src/masks/definitions/diamond.ts
index 037aee70..fe96dbe9 100644
--- a/apps/web/src/masks/definitions/diamond.ts
+++ b/apps/web/src/masks/definitions/diamond.ts
@@ -1,4 +1,4 @@
-import type { MaskDefinition, RectangleMaskParams } from "@/masks/types";
+import type { MaskDefinition } from "@/masks/types";
 import {
 	BOX_LIKE_MASK_PARAMS,
 	buildBoxMaskInteraction,
@@ -45,7 +45,7 @@ function buildDiamondPath({
 	return path;
 }
 
-export const diamondMaskDefinition: MaskDefinition<RectangleMaskParams> = {
+export const diamondMaskDefinition: MaskDefinition<"diamond"> = {
 	type: "diamond",
 	name: "Diamond",
 	features: {
@@ -68,33 +68,39 @@ export const diamondMaskDefinition: MaskDefinition<RectangleMaskParams> = {
 	},
 	computeParamUpdate: computeBoxMaskParamUpdate,
 	renderer: {
-		buildPath({ resolvedParams, width, height }) {
-			const params = resolvedParams as RectangleMaskParams;
-			const { centerX, centerY, maskWidth, maskHeight, rotationRad } =
-				getBoxLikeGeometry({ params, width, height });
-			return buildDiamondPath({
-				centerX,
-				centerY,
-				halfWidth: maskWidth / 2,
-				halfHeight: maskHeight / 2,
-				rotationRad,
-			});
+		body: {
+			kind: "fillPath",
+			buildPath({ resolvedParams, width, height }) {
+				const params = resolvedParams;
+				const { centerX, centerY, maskWidth, maskHeight, rotationRad } =
+					getBoxLikeGeometry({ params, width, height });
+				return buildDiamondPath({
+					centerX,
+					centerY,
+					halfWidth: maskWidth / 2,
+					halfHeight: maskHeight / 2,
+					rotationRad,
+				});
+			},
 		},
-		buildStrokePath({ resolvedParams, width, height }) {
-			const params = resolvedParams as RectangleMaskParams;
-			const { centerX, centerY, maskWidth, maskHeight, rotationRad } =
-				getBoxLikeGeometry({ params, width, height });
-			const offset = getStrokeOffset({
-				strokeAlign: params.strokeAlign,
-				strokeWidth: params.strokeWidth,
-			});
-			return buildDiamondPath({
-				centerX,
-				centerY,
-				halfWidth: Math.max(maskWidth / 2 + offset, 1),
-				halfHeight: Math.max(maskHeight / 2 + offset, 1),
-				rotationRad,
-			});
+		stroke: {
+			kind: "strokeFromPath",
+			buildStrokePath({ resolvedParams, width, height }) {
+				const params = resolvedParams;
+				const { centerX, centerY, maskWidth, maskHeight, rotationRad } =
+					getBoxLikeGeometry({ params, width, height });
+				const offset = getStrokeOffset({
+					strokeAlign: params.strokeAlign,
+					strokeWidth: params.strokeWidth,
+				});
+				return buildDiamondPath({
+					centerX,
+					centerY,
+					halfWidth: Math.max(maskWidth / 2 + offset, 1),
+					halfHeight: Math.max(maskHeight / 2 + offset, 1),
+					rotationRad,
+				});
+			},
 		},
 	},
 };
diff --git a/apps/web/src/masks/definitions/ellipse.ts b/apps/web/src/masks/definitions/ellipse.ts
index d0567817..f57d7444 100644
--- a/apps/web/src/masks/definitions/ellipse.ts
+++ b/apps/web/src/masks/definitions/ellipse.ts
@@ -1,4 +1,4 @@
-import type { MaskDefinition, RectangleMaskParams } from "@/masks/types";
+import type { MaskDefinition } from "@/masks/types";
 import {
 	BOX_LIKE_MASK_PARAMS,
 	buildBoxMaskInteraction,
@@ -8,7 +8,7 @@ import {
 	getStrokeOffset,
 } from "./box-like";
 
-export const ellipseMaskDefinition: MaskDefinition<RectangleMaskParams> = {
+export const ellipseMaskDefinition: MaskDefinition<"ellipse"> = {
 	type: "ellipse",
 	name: "Ellipse",
 	features: {
@@ -35,41 +35,47 @@ export const ellipseMaskDefinition: MaskDefinition<RectangleMaskParams> = {
 	},
 	computeParamUpdate: computeBoxMaskParamUpdate,
 	renderer: {
-		buildPath({ resolvedParams, width, height }) {
-			const params = resolvedParams as RectangleMaskParams;
-			const { centerX, centerY, maskWidth, maskHeight, rotationRad } =
-				getBoxLikeGeometry({ params, width, height });
-			const path = new Path2D();
-			path.ellipse(
-				centerX,
-				centerY,
-				maskWidth / 2,
-				maskHeight / 2,
-				rotationRad,
-				0,
-				Math.PI * 2,
-			);
-			return path;
+		body: {
+			kind: "fillPath",
+			buildPath({ resolvedParams, width, height }) {
+				const params = resolvedParams;
+				const { centerX, centerY, maskWidth, maskHeight, rotationRad } =
+					getBoxLikeGeometry({ params, width, height });
+				const path = new Path2D();
+				path.ellipse(
+					centerX,
+					centerY,
+					maskWidth / 2,
+					maskHeight / 2,
+					rotationRad,
+					0,
+					Math.PI * 2,
+				);
+				return path;
+			},
 		},
-		buildStrokePath({ resolvedParams, width, height }) {
-			const params = resolvedParams as RectangleMaskParams;
-			const { centerX, centerY, maskWidth, maskHeight, rotationRad } =
-				getBoxLikeGeometry({ params, width, height });
-			const offset = getStrokeOffset({
-				strokeAlign: params.strokeAlign,
-				strokeWidth: params.strokeWidth,
-			});
-			const path = new Path2D();
-			path.ellipse(
-				centerX,
-				centerY,
-				Math.max(1, maskWidth / 2 + offset),
-				Math.max(1, maskHeight / 2 + offset),
-				rotationRad,
-				0,
-				Math.PI * 2,
-			);
-			return path;
+		stroke: {
+			kind: "strokeFromPath",
+			buildStrokePath({ resolvedParams, width, height }) {
+				const params = resolvedParams;
+				const { centerX, centerY, maskWidth, maskHeight, rotationRad } =
+					getBoxLikeGeometry({ params, width, height });
+				const offset = getStrokeOffset({
+					strokeAlign: params.strokeAlign,
+					strokeWidth: params.strokeWidth,
+				});
+				const path = new Path2D();
+				path.ellipse(
+					centerX,
+					centerY,
+					Math.max(1, maskWidth / 2 + offset),
+					Math.max(1, maskHeight / 2 + offset),
+					rotationRad,
+					0,
+					Math.PI * 2,
+				);
+				return path;
+			},
 		},
 	},
 };
diff --git a/apps/web/src/masks/definitions/heart.ts b/apps/web/src/masks/definitions/heart.ts
index d15c09e6..ec546f18 100644
--- a/apps/web/src/masks/definitions/heart.ts
+++ b/apps/web/src/masks/definitions/heart.ts
@@ -1,4 +1,4 @@
-import type { MaskDefinition, RectangleMaskParams } from "@/masks/types";
+import type { MaskDefinition } from "@/masks/types";
 import {
 	BOX_LIKE_MASK_PARAMS,
 	buildBoxMaskInteraction,
@@ -78,7 +78,7 @@ function buildHeartPath({
 	return path;
 }
 
-export const heartMaskDefinition: MaskDefinition<RectangleMaskParams> = {
+export const heartMaskDefinition: MaskDefinition<"heart"> = {
 	type: "heart",
 	name: "Heart",
 	features: {
@@ -110,33 +110,39 @@ export const heartMaskDefinition: MaskDefinition<RectangleMaskParams> = {
 	},
 	computeParamUpdate: computeBoxMaskParamUpdate,
 	renderer: {
-		buildPath({ resolvedParams, width, height }) {
-			const params = resolvedParams as RectangleMaskParams;
-			const { centerX, centerY, maskWidth, maskHeight, rotationRad } =
-				getBoxLikeGeometry({ params, width, height });
-			return buildHeartPath({
-				centerX,
-				centerY,
-				halfWidth: maskWidth / 2,
-				halfHeight: maskHeight / 2,
-				rotationRad,
-			});
+		body: {
+			kind: "fillPath",
+			buildPath({ resolvedParams, width, height }) {
+				const params = resolvedParams;
+				const { centerX, centerY, maskWidth, maskHeight, rotationRad } =
+					getBoxLikeGeometry({ params, width, height });
+				return buildHeartPath({
+					centerX,
+					centerY,
+					halfWidth: maskWidth / 2,
+					halfHeight: maskHeight / 2,
+					rotationRad,
+				});
+			},
 		},
-		buildStrokePath({ resolvedParams, width, height }) {
-			const params = resolvedParams as RectangleMaskParams;
-			const { centerX, centerY, maskWidth, maskHeight, rotationRad } =
-				getBoxLikeGeometry({ params, width, height });
-			const offset = getStrokeOffset({
-				strokeAlign: params.strokeAlign,
-				strokeWidth: params.strokeWidth,
-			});
-			return buildHeartPath({
-				centerX,
-				centerY,
-				halfWidth: Math.max(maskWidth / 2 + offset, 1),
-				halfHeight: Math.max(maskHeight / 2 + offset, 1),
-				rotationRad,
-			});
+		stroke: {
+			kind: "strokeFromPath",
+			buildStrokePath({ resolvedParams, width, height }) {
+				const params = resolvedParams;
+				const { centerX, centerY, maskWidth, maskHeight, rotationRad } =
+					getBoxLikeGeometry({ params, width, height });
+				const offset = getStrokeOffset({
+					strokeAlign: params.strokeAlign,
+					strokeWidth: params.strokeWidth,
+				});
+				return buildHeartPath({
+					centerX,
+					centerY,
+					halfWidth: Math.max(maskWidth / 2 + offset, 1),
+					halfHeight: Math.max(maskHeight / 2 + offset, 1),
+					rotationRad,
+				});
+			},
 		},
 	},
 };
diff --git a/apps/web/src/masks/definitions/index.ts b/apps/web/src/masks/definitions/index.ts
index 9cee1020..a5aec404 100644
--- a/apps/web/src/masks/definitions/index.ts
+++ b/apps/web/src/masks/definitions/index.ts
@@ -1,5 +1,8 @@
-import type { BaseMaskParams, MaskDefinition } from "@/masks/types";
-import { masksRegistry, type MaskIconProps } from "../registry";
+import {
+	masksRegistry,
+	type MaskDefinitionForRegistration,
+	type MaskIconProps,
+} from "../registry";
 import { cinematicBarsMaskDefinition } from "./cinematic-bars";
 import { customMaskDefinition } from "./custom";
 import { diamondMaskDefinition } from "./diamond";
@@ -20,11 +23,11 @@ import {
 	TextFontIcon,
 } from "@hugeicons/core-free-icons";
 
-function registerDefaultMask<TParams extends BaseMaskParams>({
+function registerDefaultMask({
 	definition,
 	icon,
 }: {
-	definition: MaskDefinition<TParams>;
+	definition: MaskDefinitionForRegistration;
 	icon: MaskIconProps;
 }) {
 	if (masksRegistry.has(definition.type)) {
diff --git a/apps/web/src/masks/definitions/rectangle.ts b/apps/web/src/masks/definitions/rectangle.ts
index 7bf1a7fd..db7a4578 100644
--- a/apps/web/src/masks/definitions/rectangle.ts
+++ b/apps/web/src/masks/definitions/rectangle.ts
@@ -1,4 +1,4 @@
-import type { MaskDefinition, RectangleMaskParams } from "@/masks/types";
+import type { MaskDefinition } from "@/masks/types";
 import {
 	BOX_LIKE_MASK_PARAMS,
 	buildBoxMaskInteraction,
@@ -45,7 +45,7 @@ function buildRectanglePath({
 	return path;
 }
 
-export const rectangleMaskDefinition: MaskDefinition<RectangleMaskParams> = {
+export const rectangleMaskDefinition: MaskDefinition<"rectangle"> = {
 	type: "rectangle",
 	name: "Rectangle",
 	features: {
@@ -65,33 +65,39 @@ export const rectangleMaskDefinition: MaskDefinition<RectangleMaskParams> = {
 	},
 	computeParamUpdate: computeBoxMaskParamUpdate,
 	renderer: {
-		buildPath({ resolvedParams, width, height }) {
-			const params = resolvedParams as RectangleMaskParams;
-			const { centerX, centerY, maskWidth, maskHeight, rotationRad } =
-				getBoxLikeGeometry({ params, width, height });
-			return buildRectanglePath({
-				centerX,
-				centerY,
-				halfWidth: maskWidth / 2,
-				halfHeight: maskHeight / 2,
-				rotationRad,
-			});
+		body: {
+			kind: "fillPath",
+			buildPath({ resolvedParams, width, height }) {
+				const params = resolvedParams;
+				const { centerX, centerY, maskWidth, maskHeight, rotationRad } =
+					getBoxLikeGeometry({ params, width, height });
+				return buildRectanglePath({
+					centerX,
+					centerY,
+					halfWidth: maskWidth / 2,
+					halfHeight: maskHeight / 2,
+					rotationRad,
+				});
+			},
 		},
-		buildStrokePath({ resolvedParams, width, height }) {
-			const params = resolvedParams as RectangleMaskParams;
-			const { centerX, centerY, maskWidth, maskHeight, rotationRad } =
-				getBoxLikeGeometry({ params, width, height });
-			const offset = getStrokeOffset({
-				strokeAlign: params.strokeAlign,
-				strokeWidth: params.strokeWidth,
-			});
-			return buildRectanglePath({
-				centerX,
-				centerY,
-				halfWidth: Math.max(1, maskWidth / 2 + offset),
-				halfHeight: Math.max(1, maskHeight / 2 + offset),
-				rotationRad,
-			});
+		stroke: {
+			kind: "strokeFromPath",
+			buildStrokePath({ resolvedParams, width, height }) {
+				const params = resolvedParams;
+				const { centerX, centerY, maskWidth, maskHeight, rotationRad } =
+					getBoxLikeGeometry({ params, width, height });
+				const offset = getStrokeOffset({
+					strokeAlign: params.strokeAlign,
+					strokeWidth: params.strokeWidth,
+				});
+				return buildRectanglePath({
+					centerX,
+					centerY,
+					halfWidth: Math.max(1, maskWidth / 2 + offset),
+					halfHeight: Math.max(1, maskHeight / 2 + offset),
+					rotationRad,
+				});
+			},
 		},
 	},
 };
diff --git a/apps/web/src/masks/definitions/split.ts b/apps/web/src/masks/definitions/split.ts
index ddd4e452..de67b876 100644
--- a/apps/web/src/masks/definitions/split.ts
+++ b/apps/web/src/masks/definitions/split.ts
@@ -71,11 +71,11 @@ export function getSplitMaskStrokeSegment({
 	width,
 	height,
 }: {
-	resolvedParams: unknown;
+	resolvedParams: SplitMaskParams;
 	width: number;
 	height: number;
 }): [{ x: number; y: number }, { x: number; y: number }] | null {
-	const { centerX, centerY, rotation } = resolvedParams as SplitMaskParams;
+	const { centerX, centerY, rotation } = resolvedParams;
 	const { normalX, normalY, lineX, lineY } = splitLineGeometry({
 		centerX,
 		centerY,
@@ -180,7 +180,7 @@ function computeSplitMaskParamUpdate({
 	return {};
 }
 
-export const splitMaskDefinition: MaskDefinition<SplitMaskParams> = {
+export const splitMaskDefinition: MaskDefinition<"split"> = {
 	type: "split",
 	name: "Split",
 	features: {
@@ -267,124 +267,131 @@ export const splitMaskDefinition: MaskDefinition<SplitMaskParams> = {
 		},
 	],
 	renderer: {
-		renderMaskHandlesFeather: true,
-		renderMask({ resolvedParams, ctx, width, height, feather }) {
-			const { centerX, centerY, rotation } = resolvedParams as SplitMaskParams;
-			const { normalX, normalY, lineX, lineY } = splitLineGeometry({
-				centerX,
-				centerY,
-				rotation,
-				width,
-				height,
-			});
+		body: {
+			kind: "drawWithFeather",
+			drawWithFeather({ resolvedParams, ctx, width, height, feather }) {
+				const { centerX, centerY, rotation } = resolvedParams;
+				const { normalX, normalY, lineX, lineY } = splitLineGeometry({
+					centerX,
+					centerY,
+					rotation,
+					width,
+					height,
+				});
 
-			// Analytical gradient avoids JFA's two-sided distance artifact near canvas edges.
-			const featherHalf = feather / 2;
-			const gradient = ctx.createLinearGradient(
-				lineX - normalX * featherHalf,
-				lineY - normalY * featherHalf,
-				lineX + normalX * featherHalf,
-				lineY + normalY * featherHalf,
-			);
-			gradient.addColorStop(0, "rgba(255,255,255,0)");
-			gradient.addColorStop(1, "white");
+				// Analytical gradient avoids JFA's two-sided distance artifact near canvas edges.
+				const featherHalf = feather / 2;
+				const gradient = ctx.createLinearGradient(
+					lineX - normalX * featherHalf,
+					lineY - normalY * featherHalf,
+					lineX + normalX * featherHalf,
+					lineY + normalY * featherHalf,
+				);
+				gradient.addColorStop(0, "rgba(255,255,255,0)");
+				gradient.addColorStop(1, "white");
 
-			ctx.fillStyle = gradient;
-			ctx.fillRect(0, 0, width, height);
-		},
+				ctx.fillStyle = gradient;
+				ctx.fillRect(0, 0, width, height);
+			},
 
-		buildPath({ resolvedParams, width, height }) {
-			const { centerX, centerY, rotation } = resolvedParams as SplitMaskParams;
-			const { normalX, normalY, lineX, lineY } = splitLineGeometry({
-				centerX,
-				centerY,
-				rotation,
-				width,
-				height,
-			});
+			opaqueFastPath: {
+				buildPath({ resolvedParams, width, height }) {
+					const { centerX, centerY, rotation } = resolvedParams;
+					const { normalX, normalY, lineX, lineY } = splitLineGeometry({
+						centerX,
+						centerY,
+						rotation,
+						width,
+						height,
+					});
 
-			const edges: [number, number, number, number][] = [
-				[0, 0, width, 0],
-				[width, 0, width, height],
-				[width, height, 0, height],
-				[0, height, 0, 0],
-			];
+					const edges: [number, number, number, number][] = [
+						[0, 0, width, 0],
+						[width, 0, width, height],
+						[width, height, 0, height],
+						[0, height, 0, 0],
+					];
 
-			const isInsideHalfPlane = ({
-				x,
-				y,
-			}: {
-				x: number;
-				y: number;
-			}) => halfPlaneSign({ lineX, lineY, normalX, normalY, x, y }) >= 0;
+					const isInsideHalfPlane = ({
+						x,
+						y,
+					}: {
+						x: number;
+						y: number;
+					}) => halfPlaneSign({ lineX, lineY, normalX, normalY, x, y }) >= 0;
 
-			const vertices: [number, number][] = [];
-			for (const [x1, y1, x2, y2] of edges) {
-				const isVertex1Inside = isInsideHalfPlane({ x: x1, y: y1 });
-				const isVertex2Inside = isInsideHalfPlane({ x: x2, y: y2 });
+					const vertices: [number, number][] = [];
+					for (const [x1, y1, x2, y2] of edges) {
+						const isVertex1Inside = isInsideHalfPlane({ x: x1, y: y1 });
+						const isVertex2Inside = isInsideHalfPlane({ x: x2, y: y2 });
 
-				if (isVertex1Inside && isVertex2Inside) {
-					vertices.push([x2, y2]);
-				} else if (isVertex1Inside && !isVertex2Inside) {
-					const hit = lineEdgeIntersection({
-						lineX,
-						lineY,
-						normalX,
-						normalY,
-						x1,
-						y1,
-						x2,
-						y2,
-					});
-					if (hit) vertices.push([hit.x, hit.y]);
-				} else if (!isVertex1Inside && isVertex2Inside) {
-					const hit = lineEdgeIntersection({
-						lineX,
-						lineY,
-						normalX,
-						normalY,
-						x1,
-						y1,
-						x2,
-						y2,
-					});
-					if (hit) {
-						vertices.push([hit.x, hit.y]);
-						vertices.push([x2, y2]);
+						if (isVertex1Inside && isVertex2Inside) {
+							vertices.push([x2, y2]);
+						} else if (isVertex1Inside && !isVertex2Inside) {
+							const hit = lineEdgeIntersection({
+								lineX,
+								lineY,
+								normalX,
+								normalY,
+								x1,
+								y1,
+								x2,
+								y2,
+							});
+							if (hit) vertices.push([hit.x, hit.y]);
+						} else if (!isVertex1Inside && isVertex2Inside) {
+							const hit = lineEdgeIntersection({
+								lineX,
+								lineY,
+								normalX,
+								normalY,
+								x1,
+								y1,
+								x2,
+								y2,
+							});
+							if (hit) {
+								vertices.push([hit.x, hit.y]);
+								vertices.push([x2, y2]);
+							}
+						}
 					}
-				}
-			}
 
-			if (
-				vertices.length < 3 ||
-				polygonArea({ vertices }) < MIN_POLYGON_AREA_PX
-			) {
-				return new Path2D();
-			}
+					if (
+						vertices.length < 3 ||
+						polygonArea({ vertices }) < MIN_POLYGON_AREA_PX
+					) {
+						return new Path2D();
+					}
 
-			const path = new Path2D();
-			path.moveTo(vertices[0][0], vertices[0][1]);
-			for (let i = 1; i < vertices.length; i++) {
-				path.lineTo(vertices[i][0], vertices[i][1]);
-			}
-			path.closePath();
-			return path;
+					const path = new Path2D();
+					path.moveTo(vertices[0][0], vertices[0][1]);
+					for (let i = 1; i < vertices.length; i++) {
+						path.lineTo(vertices[i][0], vertices[i][1]);
+					}
+					path.closePath();
+					return path;
+				},
+			},
 		},
-		buildStrokePath({ resolvedParams, width, height }) {
-			const segment = getSplitMaskStrokeSegment({
-				resolvedParams,
-				width,
-				height,
-			});
-			const path = new Path2D();
+		stroke: {
+			kind: "strokeFromPath",
+			buildStrokePath({ resolvedParams, width, height }) {
+				const segment = getSplitMaskStrokeSegment({
+					resolvedParams,
+					width,
+					height,
+				});
+				const path = new Path2D();
 
-			if (!segment) {
-				return path;
-			}
+				if (!segment) {
+					return path;
+				}
 
-			path.moveTo(segment[0].x, segment[0].y);
-			path.lineTo(segment[1].x, segment[1].y);
-			return path;
+				path.moveTo(segment[0].x, segment[0].y);
+				path.lineTo(segment[1].x, segment[1].y);
+				return path;
+			},
 		},
 	},
 };
diff --git a/apps/web/src/masks/definitions/star.ts b/apps/web/src/masks/definitions/star.ts
index a7f8819c..2a1a9b7e 100644
--- a/apps/web/src/masks/definitions/star.ts
+++ b/apps/web/src/masks/definitions/star.ts
@@ -1,4 +1,4 @@
-import type { MaskDefinition, RectangleMaskParams } from "@/masks/types";
+import type { MaskDefinition } from "@/masks/types";
 import {
 	BOX_LIKE_MASK_PARAMS,
 	buildBoxMaskInteraction,
@@ -85,7 +85,7 @@ function buildOverlayStarPath({
 	return `${segments.join(" ")} Z`;
 }
 
-export const starMaskDefinition: MaskDefinition<RectangleMaskParams> = {
+export const starMaskDefinition: MaskDefinition<"star"> = {
 	type: "star",
 	name: "Star",
 	features: {
@@ -108,33 +108,39 @@ export const starMaskDefinition: MaskDefinition<RectangleMaskParams> = {
 	},
 	computeParamUpdate: computeBoxMaskParamUpdate,
 	renderer: {
-		buildPath({ resolvedParams, width, height }) {
-			const params = resolvedParams as RectangleMaskParams;
-			const { centerX, centerY, maskWidth, maskHeight, rotationRad } =
-				getBoxLikeGeometry({ params, width, height });
-			return buildStarPath({
-				centerX,
-				centerY,
-				halfWidth: maskWidth / 2,
-				halfHeight: maskHeight / 2,
-				rotationRad,
-			});
+		body: {
+			kind: "fillPath",
+			buildPath({ resolvedParams, width, height }) {
+				const params = resolvedParams;
+				const { centerX, centerY, maskWidth, maskHeight, rotationRad } =
+					getBoxLikeGeometry({ params, width, height });
+				return buildStarPath({
+					centerX,
+					centerY,
+					halfWidth: maskWidth / 2,
+					halfHeight: maskHeight / 2,
+					rotationRad,
+				});
+			},
 		},
-		buildStrokePath({ resolvedParams, width, height }) {
-			const params = resolvedParams as RectangleMaskParams;
-			const { centerX, centerY, maskWidth, maskHeight, rotationRad } =
-				getBoxLikeGeometry({ params, width, height });
-			const offset = getStrokeOffset({
-				strokeAlign: params.strokeAlign,
-				strokeWidth: params.strokeWidth,
-			});
-			return buildStarPath({
-				centerX,
-				centerY,
-				halfWidth: Math.max(maskWidth / 2 + offset, 1),
-				halfHeight: Math.max(maskHeight / 2 + offset, 1),
-				rotationRad,
-			});
+		stroke: {
+			kind: "strokeFromPath",
+			buildStrokePath({ resolvedParams, width, height }) {
+				const params = resolvedParams;
+				const { centerX, centerY, maskWidth, maskHeight, rotationRad } =
+					getBoxLikeGeometry({ params, width, height });
+				const offset = getStrokeOffset({
+					strokeAlign: params.strokeAlign,
+					strokeWidth: params.strokeWidth,
+				});
+				return buildStarPath({
+					centerX,
+					centerY,
+					halfWidth: Math.max(maskWidth / 2 + offset, 1),
+					halfHeight: Math.max(maskHeight / 2 + offset, 1),
+					rotationRad,
+				});
+			},
 		},
 	},
 };
diff --git a/apps/web/src/masks/definitions/text.ts b/apps/web/src/masks/definitions/text.ts
index c65564d1..aa786e78 100644
--- a/apps/web/src/masks/definitions/text.ts
+++ b/apps/web/src/masks/definitions/text.ts
@@ -205,7 +205,7 @@ function computeTextMaskParamUpdate({
 	return {};
 }
 
-export const textMaskDefinition: MaskDefinition<TextMaskParams> = {
+export const textMaskDefinition: MaskDefinition<"text"> = {
 	type: "text",
 	name: "Text",
 	features: {
@@ -370,69 +370,75 @@ export const textMaskDefinition: MaskDefinition<TextMaskParams> = {
 		return params.content.trim().length > 0;
 	},
 	renderer: {
-		renderMask({ resolvedParams, ctx, width, height }) {
-			const params = resolvedParams as TextMaskParams;
-			const { layout } = measureTextMask({ params, height });
+		body: {
+			kind: "drawOpaque",
+			drawOpaque({ resolvedParams, ctx, width, height }) {
+				const params = resolvedParams;
+				const { layout } = measureTextMask({ params, height });
 
-			ctx.save();
-			ctx.translate(
-				width / 2 + params.centerX * width,
-				height / 2 + params.centerY * height,
-			);
-			ctx.scale(params.scale, params.scale);
-			if (params.rotation) {
-				ctx.rotate((params.rotation * Math.PI) / 180);
-			}
-			drawMeasuredTextLayout({
-				ctx,
-				layout,
-				textColor: "#ffffff",
-				background: null,
-			});
-			ctx.restore();
-		},
-		renderStroke({ resolvedParams, ctx, width, height }) {
-			const params = resolvedParams as TextMaskParams;
-			const { layout } = measureTextMask({ params, height });
-
-			ctx.save();
-			ctx.translate(
-				width / 2 + params.centerX * width,
-				height / 2 + params.centerY * height,
-			);
-			ctx.scale(params.scale, params.scale);
-			if (params.rotation) {
-				ctx.rotate((params.rotation * Math.PI) / 180);
-			}
-
-			strokeMeasuredTextLayout({
-				ctx,
-				layout,
-				strokeColor: params.strokeColor,
-				strokeWidth: params.strokeWidth,
-			});
-
-			if (params.strokeAlign === "inside") {
-				ctx.globalCompositeOperation = "destination-in";
+				ctx.save();
+				ctx.translate(
+					width / 2 + params.centerX * width,
+					height / 2 + params.centerY * height,
+				);
+				ctx.scale(params.scale, params.scale);
+				if (params.rotation) {
+					ctx.rotate((params.rotation * Math.PI) / 180);
+				}
 				drawMeasuredTextLayout({
 					ctx,
 					layout,
 					textColor: "#ffffff",
 					background: null,
 				});
-			}
+				ctx.restore();
+			},
+		},
+		stroke: {
+			kind: "renderStroke",
+			renderStroke({ resolvedParams, ctx, width, height }) {
+				const params = resolvedParams;
+				const { layout } = measureTextMask({ params, height });
 
-			if (params.strokeAlign === "outside") {
-				ctx.globalCompositeOperation = "destination-out";
-				drawMeasuredTextLayout({
+				ctx.save();
+				ctx.translate(
+					width / 2 + params.centerX * width,
+					height / 2 + params.centerY * height,
+				);
+				ctx.scale(params.scale, params.scale);
+				if (params.rotation) {
+					ctx.rotate((params.rotation * Math.PI) / 180);
+				}
+
+				strokeMeasuredTextLayout({
 					ctx,
 					layout,
-					textColor: "#ffffff",
-					background: null,
+					strokeColor: params.strokeColor,
+					strokeWidth: params.strokeWidth,
 				});
-			}
 
-			ctx.restore();
+				if (params.strokeAlign === "inside") {
+					ctx.globalCompositeOperation = "destination-in";
+					drawMeasuredTextLayout({
+						ctx,
+						layout,
+						textColor: "#ffffff",
+						background: null,
+					});
+				}
+
+				if (params.strokeAlign === "outside") {
+					ctx.globalCompositeOperation = "destination-out";
+					drawMeasuredTextLayout({
+						ctx,
+						layout,
+						textColor: "#ffffff",
+						background: null,
+					});
+				}
+
+				ctx.restore();
+			},
 		},
 	},
 };
diff --git a/apps/web/src/masks/index.ts b/apps/web/src/masks/index.ts
index 3544e239..df7649e1 100644
--- a/apps/web/src/masks/index.ts
+++ b/apps/web/src/masks/index.ts
@@ -1,18 +1,50 @@
-import type { Mask, MaskDefaultContext, MaskType } from "@/masks/types";

-import { masksRegistry } from "./registry";

-import { generateUUID } from "@/utils/id";

-

-export { masksRegistry } from "./registry";

-export { registerDefaultMasks } from "./definitions";

-

-export function buildDefaultMaskInstance({

-	maskType,

-	elementSize,

-}: {

-	maskType: MaskType;

-	elementSize?: { width: number; height: number };

-}): Mask {

-	const definition = masksRegistry.get(maskType);

-	const context: MaskDefaultContext = { elementSize };

-	return { ...definition.buildDefault(context), id: generateUUID() } as Mask;

-}

+import type { Mask, MaskDefaultContext, MaskType } from "@/masks/types";
+import { masksRegistry } from "./registry";
+import { generateUUID } from "@/utils/id";
+
+export { masksRegistry } from "./registry";
+export { registerDefaultMasks } from "./definitions";
+
+type MaskWithoutId = Mask extends infer TMask
+	? TMask extends Mask
+		? Omit<TMask, "id">
+		: never
+	: never;
+
+function withMaskId({ mask, id }: { mask: MaskWithoutId; id: string }): Mask {
+	switch (mask.type) {
+		case "split":
+			return { ...mask, id };
+		case "cinematic-bars":
+			return { ...mask, id };
+		case "rectangle":
+			return { ...mask, id };
+		case "ellipse":
+			return { ...mask, id };
+		case "heart":
+			return { ...mask, id };
+		case "diamond":
+			return { ...mask, id };
+		case "star":
+			return { ...mask, id };
+		case "text":
+			return { ...mask, id };
+		case "custom":
+			return { ...mask, id };
+	}
+}
+
+export function buildDefaultMaskInstance({
+	maskType,
+	elementSize,
+}: {
+	maskType: MaskType;
+	elementSize?: { width: number; height: number };
+}): Mask {
+	const definition = masksRegistry.get(maskType);
+	const context: MaskDefaultContext = { elementSize };
+	return withMaskId({
+		mask: definition.buildDefault(context),
+		id: generateUUID(),
+	});
+}
diff --git a/apps/web/src/masks/registry.ts b/apps/web/src/masks/registry.ts
index 0bcf1cf0..64ab2f60 100644
--- a/apps/web/src/masks/registry.ts
+++ b/apps/web/src/masks/registry.ts
@@ -2,11 +2,11 @@ import { MAX_FEATHER } from "@/masks/feather";
 import type { ParamDefinition } from "@/params";
 import type {
 	BaseMaskParams,
+	Mask,
 	MaskDefaultContext,
 	MaskDefinition,
-	MaskInteractionResult,
-	MaskSnapArgs,
-	MaskSnapResult,
+	MaskParamUpdateArgs,
+	MaskRenderer,
 	MaskType,
 } from "@/masks/types";
 import type { HugeiconsIconProps } from "@hugeicons/react";
@@ -17,6 +17,16 @@ export type MaskIconProps = {
 	strokeWidth?: number;
 };
 
+type RegisteredMaskWithoutId = Mask extends infer TMask
+	? TMask extends Mask
+		? Omit<TMask, "id">
+		: never
+	: never;
+
+export type MaskDefinitionForRegistration = {
+	[TType in MaskType]: MaskDefinition<TType>;
+}[MaskType];
+
 const BASE_MASK_PARAM_DEFINITIONS: ParamDefinition<
 	keyof BaseMaskParams & string
 >[] = [
@@ -50,28 +60,15 @@ const BASE_MASK_PARAM_DEFINITIONS: ParamDefinition<
 export interface RegisteredMaskDefinition {
 	type: MaskType;
 	name: string;
-	features: MaskDefinition<BaseMaskParams>["features"];
+	features: MaskDefinition["features"];
 	params: ParamDefinition<string>[];
-	renderer: MaskDefinition<BaseMaskParams>["renderer"];
-	interaction: {
-		getInteraction(args: {
-			params: BaseMaskParams;
-			bounds: Parameters<
-				MaskDefinition<BaseMaskParams>["interaction"]["getInteraction"]
-			>[0]["bounds"];
-			displayScale: number;
-			scaleX: number;
-			scaleY: number;
-		}): MaskInteractionResult;
-		snap?(args: MaskSnapArgs<BaseMaskParams>): MaskSnapResult<BaseMaskParams>;
-	};
-	isActive?: (params: BaseMaskParams) => boolean;
-	buildDefault(
-		context: MaskDefaultContext,
-	): ReturnType<MaskDefinition<BaseMaskParams>["buildDefault"]>;
+	renderer: MaskRenderer<BaseMaskParams>;
+	interaction: MaskDefinition["interaction"];
+	isActive?(params: BaseMaskParams): boolean;
+	buildDefault(context: MaskDefaultContext): RegisteredMaskWithoutId;
 	computeParamUpdate(
-		args: Parameters<MaskDefinition<BaseMaskParams>["computeParamUpdate"]>[0],
-	): ReturnType<MaskDefinition<BaseMaskParams>["computeParamUpdate"]>;
+		args: MaskParamUpdateArgs<BaseMaskParams>,
+	): ReturnType<MaskDefinition["computeParamUpdate"]>;
 	icon: MaskIconProps;
 }
 
@@ -83,11 +80,11 @@ export class MasksRegistry extends DefinitionRegistry<
 		super("mask");
 	}
 
-	registerMask<TParams extends BaseMaskParams>({
+	registerMask({
 		definition,
 		icon,
 	}: {
-		definition: MaskDefinition<TParams>;
+		definition: MaskDefinitionForRegistration;
 		icon: MaskIconProps;
 	}): void {
 		const withBaseParams: RegisteredMaskDefinition = {
@@ -96,23 +93,10 @@ export class MasksRegistry extends DefinitionRegistry<
 			features: definition.features,
 			params: [...definition.params, ...BASE_MASK_PARAM_DEFINITIONS],
 			renderer: definition.renderer,
-			interaction: {
-				getInteraction(args) {
-					return definition.interaction.getInteraction(args as never);
-				},
-				snap: definition.interaction.snap
-					? (args) => definition.interaction.snap?.(args as never) as never
-					: undefined,
-			},
-			isActive: definition.isActive
-				? (params) => definition.isActive?.(params as TParams) ?? true
-				: undefined,
-			buildDefault(context) {
-				return definition.buildDefault(context);
-			},
-			computeParamUpdate(args) {
-				return definition.computeParamUpdate(args as never);
-			},
+			interaction: definition.interaction,
+			isActive: definition.isActive,
+			buildDefault: definition.buildDefault,
+			computeParamUpdate: definition.computeParamUpdate,
 			icon,
 		};
 		this.register({
diff --git a/apps/web/src/masks/types.ts b/apps/web/src/masks/types.ts
index 4f6c90aa..d35ca889 100644
--- a/apps/web/src/masks/types.ts
+++ b/apps/web/src/masks/types.ts
@@ -131,32 +131,50 @@ export type Mask =
 	| TextMask
 	| CustomMask;
 
-export interface MaskRenderer {
-	buildPath?: (params: {
-		resolvedParams: unknown;
-		width: number;
-		height: number;
-	}) => Path2D;
-	buildStrokePath?: (params: {
-		resolvedParams: unknown;
-		width: number;
-		height: number;
-	}) => Path2D;
-	/** Renders the feathered mask directly onto ctx, bypassing JFA. */
-	renderMask?: (params: {
-		resolvedParams: unknown;
-		ctx: CanvasRenderingContext2D | OffscreenCanvasRenderingContext2D;
-		width: number;
-		height: number;
-		feather: number;
-	}) => void;
-	renderMaskHandlesFeather?: boolean;
-	renderStroke?: (params: {
-		resolvedParams: unknown;
-		ctx: CanvasRenderingContext2D | OffscreenCanvasRenderingContext2D;
-		width: number;
-		height: number;
-	}) => void;
+export type MaskByType<TType extends MaskType> = Extract<Mask, { type: TType }>;
+export type MaskParamsByType<TType extends MaskType> =
+	MaskByType<TType>["params"];
+
+type MaskPathArgs<TParams extends BaseMaskParams> = {
+	resolvedParams: TParams;
+	width: number;
+	height: number;
+};
+
+type MaskDrawArgs<TParams extends BaseMaskParams> = MaskPathArgs<TParams> & {
+	ctx: CanvasRenderingContext2D | OffscreenCanvasRenderingContext2D;
+};
+
+export type MaskBody<TParams extends BaseMaskParams = BaseMaskParams> =
+	| {
+			kind: "fillPath";
+			buildPath(args: MaskPathArgs<TParams>): Path2D;
+	  }
+	| {
+			kind: "drawOpaque";
+			drawOpaque(args: MaskDrawArgs<TParams>): void;
+	  }
+	| {
+			kind: "drawWithFeather";
+			drawWithFeather(args: MaskDrawArgs<TParams> & { feather: number }): void;
+			opaqueFastPath?: {
+				buildPath(args: MaskPathArgs<TParams>): Path2D;
+			};
+	  };
+
+export type MaskStroke<TParams extends BaseMaskParams = BaseMaskParams> =
+	| {
+			kind: "strokeFromPath";
+			buildStrokePath(args: MaskPathArgs<TParams>): Path2D;
+	  }
+	| {
+			kind: "renderStroke";
+			renderStroke(args: MaskDrawArgs<TParams>): void;
+	  };
+
+export interface MaskRenderer<TParams extends BaseMaskParams = BaseMaskParams> {
+	body: MaskBody<TParams>;
+	stroke?: MaskStroke<TParams>;
 }
 
 export interface MaskFeatures {
@@ -282,17 +300,17 @@ export interface MaskInteractionDefinition<
 	snap?(args: MaskSnapArgs<TParams>): MaskSnapResult<TParams>;
 }
 
-export interface MaskDefinition<
-	TParams extends BaseMaskParams = BaseMaskParams,
-> {
-	type: MaskType;
+export interface MaskDefinition<TType extends MaskType = MaskType> {
+	type: TType;
 	name: string;
 	features: MaskFeatures;
-	params: ParamDefinition<keyof TParams & string>[];
-	renderer: MaskRenderer;
-	interaction: MaskInteractionDefinition<TParams>;
+	params: ParamDefinition<keyof MaskParamsByType<TType> & string>[];
+	renderer: MaskRenderer<MaskParamsByType<TType>>;
+	interaction: MaskInteractionDefinition<MaskParamsByType<TType>>;
 	/** When defined and returning false, the mask is not applied and the element renders fully visible. */
-	isActive?: (params: TParams) => boolean;
-	buildDefault(context: MaskDefaultContext): Omit<Mask, "id">;
-	computeParamUpdate(args: MaskParamUpdateArgs<TParams>): Partial<TParams>;
+	isActive?(params: MaskParamsByType<TType>): boolean;
+	buildDefault(context: MaskDefaultContext): Omit<MaskByType<TType>, "id">;
+	computeParamUpdate(
+		args: MaskParamUpdateArgs<MaskParamsByType<TType>>,
+	): Partial<MaskParamsByType<TType>>;
 }